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5251 discussions

Insert CSV into database
by Ben Engbers 01 Jun '18

01 Jun '18

Hi, My goals is to use my R clientdriver to insert csv-files into a new databases. But before that, I'm experimenting with the GUI. >From the documentation for the CSV-parser, I have taken this code: for $file in file:list("/home/bengbers/DataScience/RBaseX/Examples/Parse", false(), "*.csv") return db:add("CSV_test", $file, "", map { 'parser': 'csv', 'csvparser': map { 'header': 'yes', 'separator': ';' } }) BaseX returns: Error: Stopped at /home/bengbers/DataScience/Eindopdracht/Data/file, 2/14: [FODC0002] Resource 'Test_Parse.csv' does not exist. I didn't enter this path. It was used yesterday when browsing to the datafiles that were inserted into another test-database. let $file := file:list("/home/bengbers/DataScience/RBaseX/Examples/Parse", false(), "*.csv") return $file BaseX returns: Test_Parse.csv Test_Parse (exemplaar).csv If I create a new database, it neatly adds the two csv-files. My questions are: - which query I have to use to insert csv-files? - obviously, BasexGUI uses the wrong path. How should I adjust this path? Cheers, Ben

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BaseX 9.0.2: New Maintenance Release
by Christian Grün 31 May '18

31 May '18

Hi all, A new BaseX maintenance release is available! Please visit http://basex.org to download the latest version. These are the changes: Critical bug fixes: - XQuery: Node ordering of mixed database/fragment instances - XQuery: Index rewritings of paths with nested positional predicates Improvements: - WebDAV: Much faster locking of database resources - XQuery: Enable ENFORCEINDEX for variable predicate arguments - GUI: Larger interaction components, unified font sizes Minor Bug fixes: - DBA: Suppress menu on login page - Commands: Nested evaluation with variable bindings - XQuery: Static typing of lookup expressions Enjoy, Christian

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Serialize csv xquery map
by Andy Bunce 29 May '18

29 May '18

The xqueryformat of CSV records as a sequence of arrays [1] is very useful when parsing but there seems to be no easy way to serialize from this format. Is this correct? map { "records": ["Huber", "Sepp", "Hauptstraße 13", "93547 Hintertupfing"], "names": ["Name", "First_Name", "Address", "City"] } =>csv:serialize() [SENR0001] Items of type map(xs:string, array(xs:string)) cannot be serialized. ... would be nice if it could. /Andy [1] http://docs.basex.org/wiki/CSV_Module#XQuery

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IETF Date in If-Modified-Since header
by Marco Lettere 29 May '18

29 May '18

Hello all, need to use the If-Modified-Since header in one of my APIs. The format requested is the IETF date format: If-Modified-Since: Wed, 21 Oct 2015 07:28:00 GMT as explained in [1]. If I pass the header as prescribed to a restxq made like: declare %rest:path("config") %rest:header-param("If-Modified-Since", "{$modifiedsince-ietf}") %rest:HEAD function config:check($modifiedsince-ietf as xs:string?){ I get the following exception: Cannot convert xs:string+ to xs:string?: ("Wed", "21 Oct 2015 07:28:00 GMT"). Which somehow demonstrates that , is treated as a separator of values for the header. I patched by replacing ? with * and using a string-join on the $modifiedsince-ietf before passing it to the follwoing parse-ietf-date function. But this is hard to explain and probably subject to other issues in the future. Is there a way to pass HTTP headers verbatim to the RestXQ function? thanks! M. [1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since

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no value assigned to external variables in xq when running bxs->bxs->xq
by Freihalter Thomas 29 May '18

29 May '18

Hello, I am using basex 9.0.1 and have this 3 files: test.xq: declare variable $test external; $test test.bxs: <commands> <set option="BINDINGS">test=foo</set> <run file="test.xq"/> </commands> run.bxs: <commands> <run file="test.bxs"/> </commands> Running test.bxs is okay basex -v test.bxs BINDINGS: test=foo foo Query "test.xq" executed in 5.4 ms. basex -v run.bxs BINDINGS: test=foo Stopped at test.xq, 1/18: [XPDY0002] No value assigned to $test. It look like the bindings in test.bxs get lost, when executing the superior run.bxs. Is there any solution solving this problem? 8.6.7 does not work as well. regard Thomas echo "declare variable \$test external; \$test" > test.xq; echo "<commands><set option=\"BINDINGS\">test=foo</set><run file=\"test.xq\"/></commands>" > test.bxs; echo "<commands><run file=\"test.bxs\"/></commands>" > run.bxs; basex -v test.bxs; basex -v run.bxs

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progress of query execution
by Ветошкин Владимир 29 May '18

29 May '18

Hi, everybody! My core has written in php and php-script execute xquery-scripts to get needed data. To get the progress of one large query I have to divide it into some small ones. Isn't it? Are there any more options? Maybe it is possible to get number of seconds, which needed to complete execution of query? -- С уважением, Ветошкин Владимир Владимирович

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Controlling json serialization of JSON-XML
by Hondros, Constantine (ELS-AMS) 29 May '18

29 May '18

Hello all, I'm expecting the answer to be no, but is it possible to influence the JSON serialization of <number> elements at all? xml-to-json( <map xmlns="http://www.w3.org/2005/xpath-functions"> <number key="number">10111234</number> </map> ) Results in {"number":1.0111234E7} I read this in the spec, so it looks like the number is always being cast as a double: xs:string(xs:double(fn:string($E))) TIA, Constantine ________________________________ Elsevier B.V. Registered Office: Radarweg 29, 1043 NX Amsterdam, The Netherlands, Registration No. 33156677, Registered in The Netherlands.

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Fwd: BaseX performance improvements
by Christian Grün 28 May '18

28 May '18

Hi Martin (cc to the list), > 1. each XML node => 500 bytes > 2. total size of XML DB => 10million nodes(which will grow continuously as > new files are added). So one node is one document, right? I’m just asking because, in the XML terminology, each XML document has nodes itself: element nodes, attributes nodes, text nodes, etc. If you are working with millions of documents, it can be helpful to work with a "daily" database, which contains auxiliary references on documents that have been deleted or updated. If there is a time interval in which no people access your database (e.g. each night), you can merge these databases and recreate your index structures. If you query your database, you can a few more lines of XQuery: first check your daily database, and (if it doesn’t contain the required document) look up the document in your fully indexed database. > I have to do a update of the nodes as I need to replace them. I chose delete > + insert instead of replace Please note that a replace operation can be much faster: If the structure of the updated document is similar to the old document, the document can be replace in-place. > Also, I am thinking of indexing on the node id, as that is like the primary > key on which I base my operations, any suggestions might also be helpful, Here it may also be interesting to know if you will only address documents or arbitrary nodes of your document. In the first case, addressing the document path via db:open should be sufficient [1]. In the latter case, you could possibly use the existing function db:node-id [2]. Hope this helps, Christian [1] http://docs.basex.org/wiki/Databases [2] http://docs.basex.org/wiki/Database_Module#db:node-id > Thanks again, > Regards > Martin Lourduswamy > > On Sun, May 20, 2018 at 9:28 AM, Christian Grün <christian.gruen(a)gmail.com> > wrote: >> >> Hi Martin, >> >> > I am new to BaseX, I would like ot speed up XQuery of insert and delete >> > and >> > replace through options. >> >> Welcome to the list. As there are numerous ways to do updates in >> BaseX, feel free to give us more information on your insert and delete >> operations. Do you work with large single documents or many small >> documents? How large is your database? >> >> > While I query basex through perl, and try to >> > connect through GUI, the perl connection aborts. Is there a parameters >> > for >> > parallel connections, please let me know. >> >> I can’t tell why your perl connection is interrupted by opening the >> GUI (because they should be completely independent from each other). A >> step-by-step description on how you proceeded might be helpful. >> >> Because there is no coupling between GUI and the client/server >> architecture, however, you should avoid running updates outside the >> GUI. Please check out [1] for more information. >> >> Best, >> Christian >> >> [1] http://docs.basex.org/wiki/Startup#Concurrent_Operations >> >> >> >> > >> > Thanks, >> > Regards >> > Martin Lourduswamy > >

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-math:log10(1)
by Giuseppe Celano 28 May '18

28 May '18

- math:log10(1) returns -0 but -0 returns 0: is there a reason for that? Thanks! Giuseppe Universität Leipzig Institute of Computer Science, NLP Augustusplatz 10 04109 Leipzig Deutschland E-mail: celano(a)informatik.uni-leipzig.de E-mail: giuseppegacelano(a)gmail.com Web site 1: http://www.dh.uni-leipzig.de/wo/team/ Web site 2: https://sites.google.com/site/giuseppegacelano/

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Data analysis
by Tim Clement 26 May '18

26 May '18

Hello, I’m new to basex and really like the functionality. I have very complex XML files with deep nesting. Each file is like a document with test output values and parameters. Basex ingested the files easily and I’m able to write queries to pull out data. My end goal is to plot, graph trend data. I can do basic plotting within Basex. Do you have any suggestions for tools to visualize the data trending ? I have Power BI , but its’ not great with XML input. Thanks in advance Tim

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